A rock that behaves in a(n) ________ manner will bend under stress and does not return to its original shape.
A. plastic
B. elastic
C. rubber
D. brittle
E. tactile
Answer: A
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After the drought of the 1930's farmers in the Great Plains were encouraged to plant rows of trees across fields to decrease soil erosion. How would this reduce soil erosion?
A) The trees can serve as windbreaks to slow wind erosion. B) The trees helped shade the ground, retaining moisture. C) Tree roots would retard runoff and prevent erosion. D) The trees had no effect; they were just used to improve the land appearance after the great depression.
The largest death toll from a natural disaster in the United States (over 6,000 killed) was caused by:
a. an earthquake. b. river flooding c. a hurricane. d. a landslide. e. a volcanic eruption
The most costly aspect of photovoltaic technology is being addressed by
A) inventing a way to convert alternating current to direct current. B) inventing a way to convert direct current to alternating current. C) finding a way to reduce the damaging effects of the sun on solar panels. D) new technologies that reduce the cost of manufacturing solar cells.
High cirriform clouds are composed almost entirely of ice crystals. In tropical regions, air temperatures low enough to freeze all liquid water usually occur only above 6000 m (about 20,000 ft). In polar regions, however, these same temperatures may be found at altitudes as low as 3000 m (about 10,000 ft). Hence, while you may observe cirrus clouds at 3600 m (about 12,000 ft) over northern
Alaska, you will not see them at that elevation above southern Florida. a. True b. False